Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Mritunjay Mishra 5 years, 3 months ago
- 1 answers
Posted by Subaasri Kalaiyarasan 5 years, 3 months ago
- 2 answers
Gaurav Seth 5 years, 3 months ago
Gas is evolved vigorously in the beaker 1 with HCL and not in beaker 2 with NaOH. This is because zinc reacts very fast with the HCL and very slowly with the NaOH at room temperature.
Sachin Pandey 5 years, 3 months ago
Posted by Ishika Rathore 5 years, 3 months ago
- 2 answers
Gourav Gupta 5 years, 3 months ago
Gaurav Seth 5 years, 3 months ago
Step 1:
2x+3y=9 ..............(eqn 1)
4x-6y=18 ............(eqn 2)
divide equation 2 by 2 on both sides, we get:
2x - 3y = 9
2x = 9 + 3y
x = (9+ 3y)/2 ..........(eqn 3)
step 2:
now put the value of x (from equation 3) in equation 1, we get:
2((9+ 3y)/2) + 3y = 9
(9 + 3y) +3y = 9
9 + 6y =9
6y = 9-9
6y = 0
y = 0 .........................(eqn 4)
step 3:
Now put the value of y = 0 (from equation 4) in equation 3, we get
x = (9+ 3(0))/2
x = 9/2
x = 4.5 .......................(eqn 5)
so the answer is x = 4.5 and y = 0.
step 4:
Verification:
to verify the answer we can put these values of x and y in any one of the equation 1 or equation 2.
put x = 4.5 and y = 0 in equation 1, we get
2x+3y=9
2(4.5) + 3(0) = 9
9 + 0 = 9
9 = 9
L.H.S. = R.H.S.
It means our answer is right.
Posted by Aditya Gupta 5 years, 3 months ago
- 1 answers
Posted by Shubham Sonu 5 years, 3 months ago
- 2 answers
Gauri Sharma 5 years, 3 months ago
Gaurav Seth 5 years, 3 months ago
Development involves many questions for better life and the ways in which one can work to achieve goals. Since every individual is different from each other, the notion of development also varies. The difference in social and economic positions of the people generally results in different goals of development.
Posted by Shubham Saxena ???? 5 years, 3 months ago
- 3 answers
Prabal Das 5 years, 3 months ago
Priya Yadav 5 years, 3 months ago
Posted by Risha Singh 5 years, 3 months ago
- 2 answers
Shubham Saxena ???? 5 years, 3 months ago
Yogita Ingle 5 years, 3 months ago
Respiratory System Parts and Functions
Let us have a detailed look at the different parts of the respiratory system and their functions.
Nose:The nose possesses a couple of exterior nostrils, which are divided by a framework of cartilaginous structure termed as the septum. This is the structure that evenly separates the right nostril from the left nostril. Tiny hair follicles that cover the interior lining of nostrils acts as the body’s first line of defence against foreign pathogens. Furthermore, they provide additional humidity for inhaled air.
Larynx:Two cartilaginous chords lay the framework for the larynx. They are situated at the point of joining the pharynx and trachea. It is also termed as Adam’s apple or the voice box. It is the portion which rises and falls during swallowing of food particles. It generates sound as air passes through the hollow in the middle.
Pharynx:The nasal chambers open up into a wide hollow space termed as the pharynx. It is a common path for both air and food. It functions by preventing the entry of food particles into the windpipe. The epiglottis is an elastic cartilage, which serves as a switch between the larynx and the oesophagus by allowing the passage of air into the airway to the lungs, and food in the gastrointestinal tract.
Trachea:The trachea or the windpipe rises below the larynx and moves down to the neck. The walls of trachea comprise C-shaped cartilaginous rings which give hardness to the trachea and maintain it by completely expanding. The trachea extends further down into the breastbone and splits into two bronchi, one for each lung.
Bronchi:The trachea splits into two tubes termed as bronchi, which enter each lung individually. The bronchi divide into secondary, tertiary, and to bronchioles, which is again further divided into small air-sacs called the alveoli. The alveoli are minute sacs of air with thin walls and single-celled manner. It enables the exchange of oxygen and carbon dioxide molecules into or away from the bloodstream.
Lungs: Lungs are the chief centres of the respiration in humans and other vertebrates. They are located in the thoracic cavity of the chest near the backbone and on either side of the heart. They are the pair of large, spongy organs, mainly involved in the exchange of gases between the blood and the air. Compared to the left lung, the right lung is quite bigger and heavier.
Posted by Raspreet Singh 5 years, 3 months ago
- 1 answers
Yogita Ingle 5 years, 3 months ago
Let, O is the centre of the given circle.
A tangent PR has been drawn touching the circle at point P.
Draw QP ⊥ RP at point P, such that point Q lies on the circle.
∠OPR = 90° (radius ⊥ tangent)
Also, ∠QPR = 90° (Given)
∴ ∠OPR = ∠QPR
Now, the above case is possible only when centre O lies on the line QP.
Hence, perpendicular at the point of contact to the tangent to a circle passes through the centre of the circle.
Posted by Jai Surya 5 years, 3 months ago
- 4 answers
Posted by Dhruvi Modha 5 years, 3 months ago
- 2 answers
Yogita Ingle 5 years, 3 months ago
DNA copying is an essential part of the process of reproduction because it carries the genetic information from the parents to offspring. A copy of DNA is produced through some chemical reactions resulting in two copies of DNA. Along with the additional cellular structure, DNA copying also takes place which is then followed by cell division into two cells.
Posted by Shudanshu Bora 5 years, 3 months ago
- 2 answers
Posted by Lisa Ruthway 5 years, 3 months ago
- 1 answers
Yogita Ingle 5 years, 3 months ago
India has land under a variety of relief features such as plains, plateaus, mountains and islands.About 43 per cent of land areas is plain, which provides facilities for agriculture and industry.Mountains account for 30 per cent of the total surface area of the country and ensure perennial flow of some rivers, provide facilities for tourism and ecological aspects. About 27 per cent of the area is the plateau region. It possesses rich reserves of minerals, fossil fuels and forests.
Posted by John Einstin 5 years, 3 months ago
- 1 answers
Yogita Ingle 5 years, 3 months ago
The analytical paragraph of CBSE can be on the population or the weight increasing all over the world among teenagers.
- While taking in consideration the world growth from the 1990s to 2015 we can say that it has been decreased.
- The reason is there is a limitation to everything and for families as well. At the old time, the population per family was greater than the whole community but they put stop to that.
- This is the only way to stop or country to drown in the loan, because more resources want more money.
Posted by Soheb Akhtar 5 years, 3 months ago
- 5 answers
Yogita Ingle 5 years, 3 months ago
Calcium oxide or lime is prepared by the process called calcination. Calcium carbonate or Limestone is heated to a temperature between 1250 ⁰C and 1400 ⁰C in Kilns (oven) and it decomposes to quicklime and carbon dioxide.
Posted by Ansh Shokeen 5 years, 3 months ago
- 0 answers
Posted by Ankita Srivastav 5 years, 3 months ago
- 1 answers
: (ᵔᴥᵔ) ???? (ᵔᴥᵔ) 5 years, 3 months ago
Posted by ?? ? 5 years, 3 months ago
- 1 answers
Bhakti J. Neve 5 years, 3 months ago
Posted by Subaasri Kalaiyarasan 5 years, 3 months ago
- 4 answers
Sminu Saji 5 years, 3 months ago
Yogita Ingle 5 years, 3 months ago
Clear, colorless limewater absorbs carbon dioxide readily from air, giving a milky solution. This is due to the insoluble suspension of calcium carbonate formed:
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
If excess CO2 is added, the following reaction takes place:
CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)
Shudanshu Bora 5 years, 3 months ago
Shabeena Shahid 5 years, 3 months ago
Posted by Ak18 Ak18 5 years, 3 months ago
- 1 answers
Vaishnavi Kanojia 5 years, 3 months ago
Posted by Radhekrishn Radheshyam 5 years, 3 months ago
- 1 answers
Stu Dent 5 years, 3 months ago
Posted by Rohit Rathod 5 years, 3 months ago
- 1 answers
Posted by Kanchan Agrawal 5 years, 3 months ago
- 1 answers
Meghna Thapar 5 years, 2 months ago
(a) Bleaching powder is Calcium oxychloride (CaOCl2). It is prepared by passing chlorine gas over dry slaked lime.
Reaction: Ca(OH)2+Cl2→CaOCl2+H2O
(b) When bleaching powder reacts with dilute sulphuric acid, it produces chlorine gas.
Reaction: CaOCl2+H2SO4→CaSO4+Cl2(g)+H2O(l)
(c) Two important uses of bleaching powder are-
(i) It is used for disinfecting the drinking water supply.
(ii) It is used in the manufacture of chloroform.
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Pranav Bhasin 5 years, 3 months ago
0Thank You